Aircraft known to be affected were in the area of DVR KONAN VABIK Manston. If London Info knew they were using temporary antennae, I'm surprised they just kept calling on 124.6 and did not suggest re-contacting on a different frequency. I worry if I'm seen to disappear on an ATC frequency because I've seen many reports of the efforts the controllers then have to go to in order to ensure the safety of their non-responding contact. The fact I was squawking mode S might have reduced their concern though.